当前位置: X-MOL 学术Prog. Phys. Geogr. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Channel geomorphology and riparian vegetation interactions along four anabranching reaches of the Upper Yellow River
Progress in Physical Geography: Earth and Environment ( IF 3.9 ) Pub Date : 2020-07-10 , DOI: 10.1177/0309133320938768
Meiqin Han 1 , Gary Brierley 1
Affiliation  

The fluvial biogeomorphic succession (FBS) phase model is used to appraise biogeomorphic interactions along four anabranching reaches of the Upper Yellow River. Geomorphic features and vegetation distribution patterns are combined to assess the dominant FBS phase. A notable increase in shrub and tree cover and a decrease in sedges occur with decreasing elevation from 4200 to 2200 m asl. The Maduo reach (4185 m) is characterized by the biogeomorphic phase, while the Dari (3960 m) reach is at the pioneer phase, with short shrubs playing a prominent role. Both the Maqu (3450 m) and the Guide (2117 m) reaches are ecological phase dominated (the Guide reach has been impacted by flow regulation in recent decades). Reaches other than the Maduo have experienced an increase in post-pioneer vegetation (woody plants) in recent decades, with a decrease in pioneer plant communities (grass and sedges). The Dari reach experienced the most dynamic channel planform changes, with a marked increase in short shrub patches from 2007 to 2017. An increase in woody vegetation underpinned increasingly stable geomorphic dynamics in the Maqu reach. Human activities have restricted geomorphic impacts of expanded areas of woody riparian vegetation in the Guide reach. Variability in dominant FBS phases exerts a primary control upon channel behavior and evolutionary traits in the four study reaches.

中文翻译:

黄河上游四支流域河道地貌与河岸植被相互作用

河流生物地貌演替 (FBS) 阶段模型用于评估沿黄河上游四个分支的生物地貌相互作用。结合地貌特征和植被分布模式来评估主要的 FBS 阶段。随着海拔从 4200 米降低到 2200 米,灌木和乔木覆盖率显着增加,莎草减少。玛多河段(4185米)为生物地貌阶段,达日河段(3960米)处于开拓期,短灌木作用突出。玛曲河段(3450 米)和贵德河段(2117 米)均以生态相为主(贵德河段在近几十年来受到流量调节的影响)。近几十年来,除玛多以外的其他河段经历了后先锋植被(木本植物)的增加,随着先锋植物群落(草和莎草)的减少。达里河段经历了最动态的河道地貌变化,从 2007 年到 2017 年,短灌木斑块显着增加。木本植被的增加支撑了玛曲河段越来越稳定的地貌动态。人类活动限制了Guide河岸木本河岸植被扩大区域的地貌影响。主要 FBS 阶段的可变性对四个研究河段的通道行为和进化特征施加了主要控制。人类活动限制了Guide河岸木本河岸植被扩大区域的地貌影响。主要 FBS 阶段的可变性对四个研究河段的通道行为和进化特征施加了主要控制。人类活动限制了Guide河岸木本河岸植被扩大区域的地貌影响。主要 FBS 阶段的可变性对四个研究河段的通道行为和进化特征施加了主要控制。
更新日期:2020-07-10
down
wechat
bug